Improvement in amalgamating-pans



E. COLEMAN. Amalgamating-Pan.

No. 219,912. Pafemed sept. 23,1879.

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NITED STATES PATENT OFFICE.

EZRA COLEMAN, OF SAN FRANCISCO, CALIFORNIA.

IMPROVEMENT IN AMALGAMATlNG-PANS.

Speciiication forming part of Letters Patent No. 219,912, dated September 23, 1879; application led June 30,1879. Z ,i

' of California, have invnted certain Improvements in Amalgamating-Pans; and Ido herebyT declare that the following is a full, clear, and

exact description thereof, reference being had to the accompanying'drawings.

My invention relates,` first, to an improved arrangement for applying and securin g steambottomsin amalgamating-pans; and, second, to the application of a removable wearing-bottom above the steam-bottom, by means of Which the steam-bottom is protected from wear,.all as hereinafter speciied.

Referring to the accompanying. drawings, Figure l is a view of 4an amalgamatingpan provided with my improved steam-bottom. Fig. 2 is a plan view of the bottom of' said pan. Fig. 3 shows the under side ot' the steambottom; Fig. 4 shows the upper side of the steam-bottom, and Fig. 5 shows the under side of the false bottom.

Let A represent an amalgamating-pan. Inside of the pan l form a shallow ledge, b, which extends entirely around the kouter edge of the bottom, close to the side of the pan, and around thebase of the boss or central standard, C, I make another ledge, d, as shown. These ledges form supports forthe inner and outer rims of the steam-bottom F to rest upon. I then form two or more tapering dovetail grooves, e e, in the bottom of the pan, between these ledges, and on the under side of the steam-bottom I form a like number of tapering dovetailribs, h h, which will enter and lock into the dovetail grooves when the steam-bottom is properly placed and slightly rotated, so as to turn the ribs into the grooves.

- rEhe most convenient arrangement for forming the grooves in the bottom of thepan is to cast two lugs close together on the bottom Wherever a groove is required, and then form their in ner edgesinto the proper form of groove, as represented in the drawings. These lugs should not be as high as the supporting-ledges b d, so that the tightening of the dovetail ribs inthe grooves will draw the steam-bottom down and clamp itsedges upon'the ledges.

The space between the pan-bottom and attached steam-bottom will then form'the steamspace, and this space can be madetperfectly tight by packing the space between the edge of 1ghe false bottom and the side of the pan and hu L is a false wearing-bottom, which l secure upon the steam-bottom by dovetailfastenin gs in a manner similar to that above described for the steam-bottom, only no ledges are used between them, so that the false bottom will lie close against the steam-bottom. l

In the upper side ofthe steam-bottom I make two or more tapering dovetail grooves, la k, and, on the under side of the wearing-bottom I form or secure tapering dovetail ribs or pins n, so that they will enter the grooves la k .and turn into them, thus securing the false bottom close against the steam bottom. The wear of the muller will then come upon the false or wearin g bottom, which can be worn completely out Without injury to the steambottoimand when worn out it can be removed" and a new one substituted. This is of great importance, as heretofore the steam bottom Vformed the wearing-surface, and it soon woreLout, so that an entire new steam-bottom had` toghe substituted. I y

My arrangement, however, gives a plain disk for a Wearing-bottom, and it `can easily be removed and another substituted.

The taper of the dovetails isin` the direction of the rotation of the muller, so thatthe tendency of the pressure is to keep the parts tight! ened together.

I am thus able to greatly econ'omize in the wear of amalgamating-pans, and at the same time save the trouble and annoyancearising from the destruction of the pan.v i

Having thus described my invention, what I claim, and desire to secure byLetters Patent, is

1. The amalgamating-pan constructed with the ledges b d, and the projections forming dovetail grooves on the bottom,` in combination with the false bottom, having. dovetail tongues to fit the grooves, substantially as described.

2. In combination with the amalgamatingpan A, provided with the bottom F, the false In witness whereof I have hereunto setl my or wearing bottom L, fox` the purpose speci hand and seal. ed.

3. rlhe false or wearing bottom L, secured to the steam-bottom F of an amalgamating pan by means of tapering dovetail ribs and grooves, substantially as specified.

EZRA COLEMAN. fL. s.;

Witnesses:

W. FLOYD DUCKETT, D. B. LAWLERw 

